Services to Industry by Libraries of Federal Government Agencies

published or submitted for publicatio

A fundamental approach to adhesion: Synthesis, surface analysis, thermodynamics and mechanics

The effects of composites as adherends was studied. Several other variables were studied by fractography: aluminum powder adhesive filler, fiber glass cloth scrim or adhesive carrier, new adhesives PPQ-413 and LARC-13, and strength-test temperature. When the new results were juxtaposed with previous work, it appeared that complex interactions between adhesive, adherend, bonding, and testing conditions govern the observed strength and fracture-surface features. The design parameters likely to have a significant effect upon strength-test results are listed

Convective instability and transient growth in steady and pulsatile stenotic flows

We show that suitable initial disturbances to steady or long-period pulsatile flows in a straight tube with an axisymmetric 75%-occlusion stenosis can produce very large transient energy growths. The global optimal disturbances to an initially axisymmetric state found by linear analyses are three-dimensional wave packets that produce localized sinuous convective instability in extended shear layers. In pulsatile flow, initial conditions that trigger the largest disturbances are either initiated at, or advect to, the separating shear layer at the stenosis in phase with peak systolic flow. Movies are available with the online version of the paper

Convective instability and transient growth in flow over a backward-facing step

Transient energy growths of two- and three-dimensional optimal linear perturbations to two-dimensional flow in a rectangular backward-facing-step geometry with expansion ratio two are presented. Reynolds numbers based on the step height and peak inflow speed are considered in the range 0–500, which is below the value for the onset of three-dimensional asymptotic instability. As is well known, the flow has a strong local convective instability, and the maximum linear transient energy growth values computed here are of order 80×103 at Re = 500. The critical Reynolds number below which there is no growth over any time interval is determined to be Re = 57.7 in the two-dimensional case. The centroidal location of the energy distribution for maximum transient growth is typically downstream of all the stagnation/reattachment points of the steady base flow. Sub-optimal transient modes are also computed and discussed. A direct study of weakly nonlinear effects demonstrates that nonlinearity is stablizing at Re = 500. The optimal three-dimensional disturbances have spanwise wavelength of order ten step heights. Though they have slightly larger growths than two-dimensional cases, they are broadly similar in character. When the inflow of the full nonlinear system is perturbed with white noise, narrowband random velocity perturbations are observed in the downstream channel at locations corresponding to maximum linear transient growth. The centre frequency of this response matches that computed from the streamwise wavelength and mean advection speed of the predicted optimal disturbance. Linkage between the response of the driven flow and the optimal disturbance is further demonstrated by a partition of response energy into velocity components

What Are Kinship Terminologies, and Why Do We Care? A Computational Approach to Analyzing Symbolic Domains

Kinship is a fundamental feature and basis of human societies. We describe a set of computational tools and services, the Kinship Algebra Modeler, and the logic that underlies these. These were developed to improve how we understand both the fundamental facts of kinship, and how people use kinship as a resource in their lives. Mathematical formalism applied to cultural concepts is more than an exercise in model building, as it provides a way to represent and explore logical consistency and implications. The logic underlying kinship is explored here through the kin term computations made by users of a terminology when computing the kinship relation one person has to another by referring to a third person for whom each has a kin term relationship. Kinship Algebra Modeler provides a set of tools, services and an architecture to explore kinship terminologies and their properties in an accessible manner

Justice or Injustice for the Poor?: A Look at the Constitutionality of Congressional Restrictions on Legal Services

Upon enacting the Legal Services Corporation Act in 1974, Congress created the Legal Services Corporation (LSC), which provides federal funding to grantees that perform legal services for low-income individuals. In recent years, Congress has enacted restrictions upon grantees\u27 receipt of such federal funding, limiting the legal services these legal aid attorneys can provide to their clients. This move has sparked great debate. Proponents of the restrictions argue that they are needed to correct abuse and misuse of the legal services program, while opponents argue that the restrictions only harm low-income individuals. In this Note, the author addresses this controversial issue by first examining the purpose and history of the Legal Services Corporation. The author then examines recent Supreme Court opinions analyzing the constitutionality of attaching conditions to the use of federal funds. In applying the unconstitutional conditions doctrine recently set out by the Supreme Court, the author argues that many of Congress\u27s recent restrictions are not only harmful; they are unconstitutional. The author argues that many of the restrictions Congress recently has enacted interfere with the protected attorney-client relationship and implicate First Amendment concerns. Specifically, the author argues that the restrictions prohibiting welfare-reform advocacy and abortion-related litigation constitute viewpoint discrimination and thus are unconstitutional. Also unconstitutional are the restrictions on lobbying and influencing the government because they are impermissibly overbroad. Finally, the author argues that restrictions requiring affiliate organizations of grantees to satisfy certain program integrity requirements unconstitutionally restrict grantees\u27 right to engage in prohibited speech or activities using non-LSC funds. The author concludes the Note by arguing that in enacting the recent restrictions, Congress has thwarted the purpose of the Legal Services Corporation Act. Instead of providing justice for low-income individuals, the restrictions only create more injustice

Crystal structure analysis of intermetallic compounds

Study concerns crystal structures and lattice parameters for a number of new intermetallic compounds. Crystal structure data have been collected on equiatomic compounds, formed between an element of the Sc, Ti, V, or Cr group and an element of the Co or Ni group. The data, obtained by conventional methods, are presented in an easily usable tabular form

A Study to Determine the Order in Which Major Tools are Desired by Industrial Arts Instructors in South Dakota

The primary objective of this study was to formulate a guide for school administrators or industrial arts instructors to consult when deciding which major tools are necessary for an industrial arts program. The study concerned the following factors: the order of preference of major tools, the size of tools desired